A fish is reeled in at a rate of 1 foot per second from a point 10 feet above the water.

At what rate is the angle ∅ between the line and the water changing when there is a total of 25 feet of line from the end of the rod to the water?

At what rate is the angle ∅ between the line and the water changing when there is a total of 25 feet of line from the end of the rod to the water?